So, people see best in the wavelength around 500nm which is a green/blue color. Why aren’t car headlights this color to improve visibility? Why can’t you buy headlight bulbs that emit bright green light? A white light with a green filter would just make it more dim, but on headlights you want brightness.
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If headlights are limited to one color, they will severely hinder visibility.
On headlights, you do *not* want brightness. You want the appropriate amount of brightness.
The ideal headlight is bright enough to allow you to see bit dim and low enough to allow other drivers to see. It is also red-tinted to minimize its impairment to night vision.
Green lights are basically going to cause you to see in black and white, and also ruin your night vision. Two things which are very limiting.
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